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Step 5Bonfire!
Next, we set up the heat exchanger and built a nice big fire underneath it. We had to make sure to get our water running before the fire got going. Otherwise, the exchanger would get absurdly hot, and we didn't want to risk our fittings melting off or the tubing itself getting slagged.
Note that our exchanger would have worked better if it had some partial windscreens on the sides of the frame. A lot of the heat was getting blown out from under the exchanger, so we would periodically add sheets of plywood to block some of the wind. The plywood would continually burn, of course, so it was a bit of a chore to keep adding more.
On the plus side, the water in hot tub was getting warmer by the minute. The stuff coming out of the exchanger was scalding hot!
Note that our exchanger would have worked better if it had some partial windscreens on the sides of the frame. A lot of the heat was getting blown out from under the exchanger, so we would periodically add sheets of plywood to block some of the wind. The plywood would continually burn, of course, so it was a bit of a chore to keep adding more.
On the plus side, the water in hot tub was getting warmer by the minute. The stuff coming out of the exchanger was scalding hot!
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